Characterization of Microstructural Changes in a Duplex Stainless Steel Using Spectral Analysis and Conventional Ultrasonic Techniques
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Edda Rodríguez
Abstract
In the present study, spectral analysis of ultrasonic signals and measurements of the velocity of longitudinal ultrasonic waves have been carried out on a duplex stainless steel type 2205. Specimens were annealed at 875°C in time periods between 1800 and 86400 s in order to promote microstructural changes associated to σ-phase formation. Transducers with frequencies of 5, 10 and 17 MHz were used to obtain power spectra. The spectra corresponding to long time treatments showed a high attenuation of the ultrasonic waves, which is attributed to the precipitation of σ-phase and secondary austenite. Furthermore, overall results suggest that spectra obtained at frequencies of 10 and 17 MHz allow, with acceptable accuracy, distinguishing the microstructural changes that take place in this duplex steel for prolonged aging times.
Kurzfassung
Für die diesem Beitrag zugrunde liegende Studie wurden an einem Duplexstahl des Typs 2205 Spektralanalysen der Ultraschallsignale und Geschwindigkeitsmessungen der Longitudinalwellen durchgeführt. Hierzu wurden Proben bei 875°C über Zeiträume von 1800 und 86400 s geglüht, um Gefügeveränderungen im Zusammenhang mit der σ-Phase hervorzurufen. Es wurden Empfänger mit den Frequenzen 5, 10 und 17 MHz verwendet, um die Leistungsspektren aufzunehmen. Die Spektren im Zusammenhang mit den Langzeitwärmebehandlungen zeigten eine große Abschwächung der Ultraschallwellen, die dem Ausscheiden der σ-Phase und Sekundäraustenits zugeordnet werden konnten. Darüber hinaus zeigen die Ergebnisse insgesamt, dass die Spektren, die bei 10 und 17 MHz aufgenommen wurden, mit akzeptabler Genauigkeit eine Unterscheidung der Gefügeveränderungen erlauben, die in diesem Duplexstahl bei langen Glühzeiten auftreten.
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Articles in the same Issue
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Zur Auswertung von Schwingfestigkeitsversuchen im Zeitfestigkeitsbereich —
- Zur Auswertung von Schwingfestigkeitsversuchen im Zeitfestigkeitsbereich —
- General Standard for Welding Simulation*
- Influence of Depth Alignment of E-Glass Fiber Reinforcements on Dental Base Polymer Flexural Strength
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- Numerical Optimization of Dental Implant Through the Concept of Functionally Graded Materials
- Characterization of Microstructural Changes in a Duplex Stainless Steel Using Spectral Analysis and Conventional Ultrasonic Techniques
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